To implement a 16-channel RF breast coil for PET/MR
hybrid imaging, systematic performance tests were
realized. The MRI performance was tested using modular
PET/MR breast phantoms featuring high resolution MR-visible
inserts and PET-visible spheres with various diameters.
Signal-to-noise maps and spatial resolution were
evaluated. Whereas the coil was designed to minimize the
attenuation of PET photons, CT-based attenuation
correction of the coil was performed and PET
quantification was evaluated in phantom experiments. The
RF coil was then tested in PET/MR breast imaging on four
breast cancer patients. Attenuation correction enabled
correct PET activity quantification in PET/MR phantom
and patient studies.

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